Hardware requirements

Micro USB cable
Two MIMX8ULP-EVK/EVK9 board
JLink Plus
5V power supply
Personal Computer

Board settings

Populate J8 for two boards. The example requires connecting between CAN pins of two boards. The connection should be set as follows:

Between two boards:

J8-1(CANH) node A, J8-1(CANH) node B
J8-2(CANL) node A, J8-2(CANL) node B
J8-3(GND) node A, J8-3(GND) node B

Prepare the Demo

Connect 5V power supply and JLink Plus to the board, switch SW10 to power on the board
Connect a micro USB cable between the host PC and the J17 USB port on the target board.
Open a serial terminal with the following settings:
- 115200 baud rate
- 8 data bits
- No parity
- One stop bit
- No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.

Running the demo

After connecting the two boards, these instructions display on each terminal window. One board must be chosen as node A and the other board as node B. (Note: Node B should start first) Data is sent continuously between the node A and the node B.

This message displays on the node A terminal:

********* FLEXCAN PingPong Buffer Example *********
    Message format: Standard (11 bit id)
    Node B Message buffer 1 to 4 used as Rx queue 1.
    Node B Message buffer 5 to 8 used as Rx queue 2.
    Node A Message buffer 8 used as Tx.
*********************************************

Please select local node as A or B:
Note: Node B should start first.
Node:A
Please input the number of CAN/CANFD messages to be send and end with enter.
100
Transmission done.

Please input the number of CAN/CANFD messages to be send and end with enter.

This message displays on the node B terminal:

********* FLEXCAN PingPong Buffer Example ********* Message format: Standard (11 bit id) Node B Message buffer 1 to 4 used as Rx queue 1. Node B Message buffer 5 to 8 used as Rx queue 2. Node A Message buffer 8 used as Tx.

Please select local node as A or B: Note: Node B should start first. Node:B Start to Wait data from Node A

Read Rx MB from Queue 1. Rx MB ID: 0x321, Rx MB data: 0x0, Time stamp: 20971 Rx MB ID: 0x321, Rx MB data: 0x1, Time stamp: 56187 Rx MB ID: 0x321, Rx MB data: 0x2, Time stamp: 56867 Rx MB ID: 0x321, Rx MB data: 0x3, Time stamp: 57547 Read Rx MB from Queue 2. Rx MB ID: 0x321, Rx MB data: 0x4, Time stamp: 56187 Rx MB ID: 0x321, Rx MB data: 0x5, Time stamp: 56867 Rx MB ID: 0x321, Rx MB data: 0x6, Time stamp: 57547 Rx MB ID: 0x321, Rx MB data: 0x7, Time stamp: 57547 Wait Node A to trigger the next 8 messages!

Read Rx MB from Queue 1. Rx MB ID: 0x321, Rx MB data: 0x8, Time stamp: 61657 Rx MB ID: 0x321, Rx MB data: 0x9, Time stamp: 31304 Rx MB ID: 0x321, Rx MB data: 0xa, Time stamp: 31983 Rx MB ID: 0x321, Rx MB data: 0xb, Time stamp: 32662 Read Rx MB from Queue 2. Rx MB ID: 0x321, Rx MB data: 0xc, Time stamp: 31304 Rx MB ID: 0x321, Rx MB data: 0xd, Time stamp: 31983 Rx MB ID: 0x321, Rx MB data: 0xe, Time stamp: 32662 Rx MB ID: 0x321, Rx MB data: 0xf, Time stamp: 32662 Wait Node A to trigger the next 8 messages!

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